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This is the prelim CL to the implementation of updater install test
to create a basic folder structure and import constants from C++
integration tests.

Bug: 1130847
Change-Id: I0d414517f749d76f54e66643a0d64b4e43df6c6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422092
Commit-Queue: Anjali Doneria <adoneria@google.com>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815266}